Feature Request : fallback model list

[blouflab]

Description

Hello,

I would really like a feature allowing us to predefine many models on which to fallback when rates exceeded or any others cause for the one we're currently using.

I would have helped you willingly, and contribute more but unfortunately I don't know the Go language.

Thanks 👍 You're doing a great job.

[LarsArtmann]

Related to #1414